Alert archive / Montana / Mesoscale Discussions in 2007

Mesoscale Discussion 1168

June 16, 200715 counties in Montana; 5 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2007, 6:59 PM MDT for 15 counties in Montana; 5 counties in Wyoming. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jun 16, 2007, 6:59 PM MDT (00:59 UTC)
Expired: Jun 16, 2007, 8:30 PM MDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Treasure County, MT, Valley County, MT, Campbell County, WY, Crook County, WY, Johnson County, WY, Sheridan County, WY, Weston County, WY

The radar

The Billings radar (KBLX), 183 km from the middle of the area, began a volume at 01:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.0 hours before the alert went out and 195 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 205 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1742 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 388 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 16, 6:02 PM MDT	Mesoscale Discussion	SPC	Big Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 16 more	88 min
Jun 16, 8:06 PM MDT	Mesoscale Discussion	SPC	Richland, Wibaux	54 min
Jun 16, 10:23 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Dawson, Fallon, Garfield and 7 more	97 min
Jun 17, 12:32 AM MDT	Mesoscale Discussion	SPC	Fergus, Garfield, McCone, Petroleum	28 min
Jun 17, 12:53 AM MDT	Severe Thunderstorm Watch	SPC	Custer, Dawson, Fergus, Garfield, Golden Valley, Judith Basin and 9 more	4 hr
Jun 17, 4:02 AM MDT	Mesoscale Discussion	SPC	Custer, Dawson, Fallon, Powder River, Prairie, Richland and 2 more	58 min
Jun 17, 4:40 AM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Custer, Dawson, Fallon, Prairie, Richland and 3 more	3 hr
Jun 17, 2:53 PM MDT	Mesoscale Discussion	SPC	Campbell, Crook, Johnson, Weston	97 min
Jun 17, 3:08 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Crook, Weston	6 hr
Jun 17, 5:56 PM MDT	Mesoscale Discussion	SPC	Weston	94 min

Nearby

Mesoscale Discussions in Montana, 2007 Mesoscale Discussions in Wyoming, 2007 Every mesoscale discussion in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.